AggregateJXPathBindingBuilder provides a helper class for the Factory
implemented in JXPathBindingManager that helps construct the
actual AggregateJXPathBinding out of the configuration in the
provided configElement which looks like:
<fb:aggregate id="widget-id" path="xpath-expression">
<fb:field id="sub-widget-id" path="relative-xpath" />
</fb:aggregate>

AggregateJXPathBindingBuilder provides a helper class for the Factory
implemented in JXPathBindingManager that helps construct the
actual AggregateJXPathBinding out of the configuration in the
provided configElement which looks like:
<wb:aggregate id="widget-id" path="xpath-expression">
<wb:field id="sub-widget-id" path="relative-xpath" />
</wb:aggregate>